第39卷第4期电站系统工程Vol.39No.42023年7月PowerSystemEngineering9文章编号:1005-006X(2023)04-0009-06某600MW超临界锅炉综合降排烟温度改造方案及节能效果李红兵1,2刘一1,2周棋1,2(1.清洁燃烧与烟气净化四川省重点实验室,2.东方电气集团东方锅炉股份有限公司)摘要:针对某600MW超临界锅炉实际情况,介绍了实现全负荷脱硝和大幅度降低排烟温度提升经济性能的综合技术改造方案,论述了水媒烟气/空气换热器系统的节能原理和措施,并对锅炉完成改造后的实际运行情况和效果进行了说明。方案大幅度降低锅炉排烟温度20~30℃,并满足全工况脱硝要求,采用机炉耦合方式实现不同季节、不同负荷、不同煤种,在保证低温受热面安全的情况下自动调整锅炉排烟损失与汽机冷端损失,维持机组经济性能,增加了锅炉适应运行条件变化的能力。在相同末端受热面低温腐蚀及堵灰条件下,环境温度越低、煤种腐蚀性越强,本方案的节煤潜力越大。关键词:分级省煤器;排烟温度;冷端温度;余热利用中图分类号:TK227文献标识码:ASchemeandEnergy-savingEffectofExhaustTemperatureReductionModificationfor600MWSupercriticalBoilerLIHong-bing1,2,LIUYi1,2,ZHOUQi1,2(1.CleanCombustionandFlueGasPurificationKeyLaboratoryofSichuanProvince,2.DongfangBoilerCo.,Ltd.)Abstract:Accordingtotheactualsituationofa600MWsupercriticalboiler,acomprehensivemodificationschemetoachievefullloaddenitrationandgreatlyreduceexhaustgastemperatureisintroduced.Theenergysavingtheoryandmethodofwatermediumfluegas/airheatexchangesystemareexpounded,theactualeffectofthemodificationisdescribed.Themodificationschemegreatlyreducedtheboilerexhaustgastemperatureby20-30℃,achievedfullloaddenitrationandautomaticallyadjustedboilerexhaustlossandturbinecoldendlosstomaintainuniteconomicperformanceunderdifferentseasons,loadsandcoaltypesonthepremiseofensuringthesafetyoflow-temperatureheatingsurface,increasedtheabilitytoadapttochangesinoperatingconditions.Underthesameconditionsoflowtemperaturecorrosionandashblockageofthelastheatingsurface,thelowertheambienttemperatureisandthestrongerthecorrosivityofcoalis,thegreaterthecoalsavingpotentialofthisschemewillbe.Keywords:gradingeconomizer;exhausttemperature;coldendtempera...